One of the most fun inventions of my lifetime is the Mini.

So many of the things I invented I honestly did for fun, out of some perverse game of whether or not they’d work, whether people would use them. I mean, it was like setting up a guillotine in the public square. You don’t expect a thousand people to line up to put their heads in it

You'd need a lot of mini-subs.

among the most fascinating of human social or economic inventions.

Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.

An amazing invention - but who would ever want to use one?